Rebound-check for vehicles



C. S. BURTON.

REBOUND CHECK FOR VEHICLES.

APPLICATION FILED SEPT. s. `19| 9.

Patented Apr. 27, 19201.

onirnn sirarns ,PATENT orrion,

OHARLESS. BURTON, OF OAK PARK, ILLINOIS.

REBOUND-CHECK Fon VEHICLES.

.specification of Letters raient. Patented Apr. 27, 1920.

Application led September 8, 1919. Serial No. 322,514.

shock to which the' bo'dies or load carrying members of a vehicle, particularly a s ring supported vehicle, are exposed from te up and down movements of thewhcels vand axles resultant from passing over ir regu'larities'in the road bed or the like. It consists in the elements and features ot construction shown and described, as indicated' in the claims.

In the drawings: Figure l is a trans-axial section of a device embodying' this invention, the parts within the inclosing case being' shown in elevation.

Fig. '2 is an edge elevation of the saine. Fig'. 3 is a section at line 3 3, on Fig'. l.

l* lis a partialside elevation of the device shown in the drawings coinprises a casing consisting of' a laterally cliambered or cup-shaped member, l, and a closure plate, 2, for closing' the otherwise open side of' the case. two complementary members, 8 3, together forming' what is substantially a drum, upon which there `is coiled a Flexible friction band, el, one end of the band being secured to one of 40 said complementary members and the band being` then coiled several times around the (lruiu comprising these two members and the tree end passed out through an aperture,

l", iii the case, the latter having` its peripheral flange extended tangentially at the side at which the' aperture, l", is seen clearly in Fig. l. The two complementary members, 3 3, have cach a cylindroidal surface, 3, said two surfaces being cou'ipleinentary to each other 'for the purpose of together i* ning' a nearly complete cylindrical n, that is, complete excepting' as to two itervals or apertures between the s; Yd two complementary members. Said complementary members, 3 3,A are mounted on pivots, 5 5, which also constitute bolts for securing together the Atwo case members, and securing the case to the vehicle, by engaging any convenient part of the body or loadcarrying members of frame structure indicated in dotted line at 10. Each of the members, 3 3, has extending from its heel, that is, beyond its fulcrum on its pivotal side a lug, 7, and these two lugs are connected together by the contractile or stretchable spring, 8, which operates to normally hold the two members 3 3, eXpanded,-tliat is, spread apart, to a limit determined only by the capacity of the case or by thc contractility of 'the spring; yand the spring' i,'ieldingly resists the contraction ot the drum closing or folding together oit 'the two incmbers,v3 3. The flexible `friction band, Ll, has its'i'ree end connected loosely to the axle ofthe vehicleor to some pai't which is tired with respect 'to the vehicle support, for which purpose it is prmfided'witli a loop or eye l1.- v

At the lowest position or" the body wi" respect to i the axle, tliat is, 1iV reached under a. maximum load. or nin shock, tliefriction band, i, is coiled sirol and smoothly about the drum compri the two members, 3 3, the latter beine" f panded to what may be considered the i mimi size of drum, thus taking' up maximum amount of the flexible band the coils which encompass the drum. il reaction from the shock by which the l is depressed, or upon release from the load or a part thereof, the rise of the body' caused bv spring support compels unl10n cao,

coiliig of some portion of 'the lief: tion band from the drum. fis tli accomplished only by the frictional ot' the coils in the band one upon ano and contraction of said coils round 'the two members constituting the rum tending' to fold said two members against the resistance of the sp ing', :tiictional resistance of the coils of the t l'ion band upon each other, and of the iiiner coil upon thc cylindroidal surfaces of the drum members, retards this reaction, preventing excessive recoil, and thereby preventing the back-:ind-forth rebound which,x in the absence of some dampir or shock absorbing device, usually/r mits 'from the shock due to irregularities in the roadbed or abrupt obstruction encountered Vby the wheels. L

lIt has heretofore been proposed to a -com l plish this Ilor like result by complementary cylindroidal members constituting a drum,

-the drum: but in such a device the frictipnal 'drag of' the friction band upon the cylin` droidal members b'eing in part directly transverse tothe movement of said members with respect to each other, andas to the remainder being equally divided onbalanced for drawing them together and pulling them apart, the net effect of the drag is a pull upon said members directly 'transverse to their movements Withrespect to each other, thereby tending to embarrass that movement. In the construction herein shown, the vdrag of the friction band on the two members of the drum, that is the pull which uncoils the band,operates on the cylindroidal periphery of the drum members in a direction which swings them about their pivots in the'linward-folding or drum-reducing movement', and said drag therefore assists instead of embarrassing the diameter-reducing movement'of the drum members. This con'- struction, therefore, Amakes the resistance of the spring the measure of the pressure by which the several c oils of the band are held in frictional contact with each other and with the drum members for causing the desired friction by which the 'recoil is damped or retarded, and avoids adding to said springs resistance,which is calculable and uniform,-any other frictional or incalculable resistance, such as results in the of September,

toward and from eachother radially with respect to the coil: and the invention claimed herein consists substantially in the manner of mounting and connecting the drum members yso as toproduce this result,

` claim: A

In a device for the purpose indicated, in combination with two members having complementary curved surfaces which to- V.gether constitute substantially a cylindrical drum; a support to `which said two members are pivoted near their ends respectively, at substantially diametrically opposite points with respect to the cylindrical said extensions for reactionto spread said members.

3. In the construction defined in claim l, the support consisting of one-side plate of a casing for inclosing the complementary members, the spring and the liexible fric-v tion band; said case comprising also an, op-

posite plate, and the two plates being tied together for inclosing said part. by the pivots of the two complementary members.

In testimonyr whereof I have hereunto set my hand at L CHARLES S. BURTON.

hicago, Illinois, this rdlday v 

